The Lenox Industrial Tools 14788 Plumbers 5 Piece Bi-Metal Utility Bit Kit features the most common size wood drilling bits for plumbing applications. These bits are designed for drilling through wood and have the ability to take out any nails that are in the way. With a high speed steel cutting edge, these bimetal bits are Tough as nails. The Tri Flue design allows for quick chip removal and creates very smooth and accurate holes. The Self feed tip allows it to start quickly and pull itself into the wood. Because of the smooth entry and quick wood chip removal, the Bi-Metal utility bit puts less strain on the drill, therefore increasing battery life and tool life. The 14788 5 - Piece set include Bit Sizes: 3/4 -Inch , 7/8-Inch, 1-Inch, 1-1/8- Inch, and 1-3/8-Inch.